Granted Patent
Utility
US 5,171,819 · App. 07/529,840
Alkyl substituted piperazines as chain extenders in polyurea elastomer systems
Inventors:
Wei-Yang Su, Dudley J. Primeaux, II, Donald H. Champion
Patented Case
View Patent ↗
Granted: Dec 15, 1992
Filed: May 29, 1990
Inventors
Wei-Yang Su
Dudley J. Primeaux, II
Donald H. Champion
Assignee (at issue)
Texaco Chemical Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.